Samsung Galaxy S3 I9300 finally joins the list of Jelly Bean devices with an official OTA firmware update using XXDLI5 ROM. The new OTA firmware update requires the installation of BUBLG3 base firmware in order to work. Those who have already installed the base firmware can continue installing the OTA update over XXDLI5 ROM. The firmware dated 17 September 2012 is exclusively meant for the UK region.

Key Points to Note

The ROM and the instructions provided in this guide are applicable only to the international version Galaxy S3 I9300 model and will not work with any other device.

As this is an official XXDLI5 ROM based Android 4.1.1 update for Galaxy S3 I9300, you will lose root access soon after installing the update. You need to root your phone again to regain full system access, and be able to install root-based third party apps again.

The instructions given in this guide are meant for reference purpose only and do not cover any warranty claims involving device damage or issues arising out of using the firmware update. Users are advised to proceed at their own risk.

Step 3 -Power off your phone and boot into Download Mode through button sequence. Press and hold the Volume Down and Home buttons together, and then tap the Power button till you get the construction Android robot icon with a triangle on screen. Hit the Power button again to confirm entry into Download Mode.

Step 5 - Boot into recovery mode using a button sequence. Press and hold the Volume Up, Home and Power buttons together until the phone reboots into recovery mode.

Step 6 - In recovery, use volume keys to navigate and select apply update from SD card and hit the Power button to install the update.

Step 7 - Press the Power button once again and click choose zip from SD card.

Step 8 - Use volume keys to navigate to the XXDLI5 OTA zip file that you copied to your SD card, and then select it using the power button. Confirm the ROM installation on the next screen and the installation procedure will begin.

Step 9 - Once the ROM is installed, hit go back and reboot the phone by tapping reboot system now from the recovery menu. The phone will restart now and the first boot may take about 5 minutes to boot. So, leave it alone.

XXDLI5 based Android 4.1.1 OTA firmware is now installed on your phone. Go to Settings > About phone to verify the firmware version installed.